define the terms of 3 related to curved surface
(a)focus (b)focal length (c)optical centre
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Explanation:
⚫ Focus
it is the point on the principal Axis through which rays of light diverge( in convex mirrors ) or towards which rays of light converge ( in concave mirrors) given by F here.
⚫ Focal length
it is the distance between the focus and the pole of the mirror given by PF here. The focal length is denoted by f.
It is found to be half of the radius of curvature.
⚫ Optical centre
It is the point on the lens that lines on the principal axis and rays of light pass through it it without deflection.
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